Paling, D. <br/><br/>
1 Numbers number systems 

 - London:  Oxford university press,  1968. 
 - 59p.;  24cm 
<br/><br/><label>ISBN: </label>194271013 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Primary Education
<br/><br/><label>Dewey Class. No.: </label>372.7  / PAL